Can one have 20-40? What does it mean to have normal vision? What does the by merator and denominator mean?
In: Biology
The two numbers are a comparison. 20-20 means you can see at 20 feet the same level of detail that a “typical good-sighted person” can see at 20 feet. The first number is you, the 2nd number is a group average. The numbers are distances in feet.
10-20 vision is bad. It means your detail limit at 10 feet is what good-sighted people can see at 20 feet. This person would need glasses for distance vision.
30-20 vision is good. It means you can see at 30 feet details that typically can only be seen at 20 feet. Pro baseball players tend to have better than 20-20 vision because it helps them see the pitcher’s grip and ball spin on the pitch.
So yeah 20-20 isn’t the max or anything, it’s just how you compare to the level o
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